To quarantine or not to quarantine
Fish have known this for millions of years. On a dive in Mexico, I encountered a small cave where there was a halocline, where the fresh ground water sat on top of the seawater. There were a dozen 3' tarpon in there and they would swim into the freshwater to kill parasites, plus it looked like they got intoxicated and were kind of doppy when they came out. In that setting you could handle them without issues. I think a little can go a long way with this treatment.
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